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(Step-by-Step) The dynamic modulus of concrete is obtained for two different concrete mixes. For the first mix, n 1 = 33, X = 115.1, and s 1 = 0.47 psi. For

Question: The dynamic modulus of concrete is obtained for two different concrete mixes. For the first mix, n 1 = 33, X = 115.1, and s 1 = 0.47 psi. For the second mix, n 2 = 31, y = 114.6, and s 2 = 0.38. Test, with a = 0.05, the null hypothesis of equality of mean dynamic modulus versus the two-sided alternative.

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